<template>
    <div class="app-controller">
        <!--查询表单-->
        <el-form :inline="true" class="demo-form-inline">
            <!-- 所属分类：级联下拉列表 -->
            <!-- 一级分类 -->
            <el-form-item label="课程类别">
                <el-select v-model="searchObj.subjectParentId" placeholder="请选择" @change="subjectLevelOneChanged">
                    <el-option v-for="subject in subjectNestedList" :key="subject.id" :label="subject.title"
                        :value="subject.id" />
                </el-select>
                <!-- 二级分类 -->
                <el-select v-model="searchObj.subjectId" placeholder="请选择">
                    <el-option v-for="subject in subSubjectList" :key="subject.id" :label="subject.title"
                        :value="subject.id" />
                </el-select>
            </el-form-item>
            <!-- 标题 -->
            <el-form-item>
                <el-input v-model="searchObj.title" placeholder="课程标题" />
            </el-form-item>
            <!-- 讲师 -->
            <el-form-item>
                <el-select v-model="searchObj.teacherId" placeholder="请选择讲师">
                    <el-option v-for="teacher in teacherList" :key="teacher.id" :label="teacher.name"
                        :value="teacher.id" />
                </el-select>
            </el-form-item>
            <el-button type="primary" icon="el-icon-search" @click="fetchData()">查询</el-button>
            <el-button type="default" @click="resetData()">清空</el-button>
        </el-form>
        <!-- 表格 -->
        <el-table v-loading="listLoading" :data="list" element-loading-text="数据加载中" border fit highlight-current-row
            row-class-name="myClassList">
            <el-table-column label="序号" width="70" align="center">
                <template slot-scope="scope">
                    {{ (page - 1) * limit + scope.$index + 1 }}
                </template>
            </el-table-column>
            <el-table-column label="课程信息" width="470" align="center">
                <template slot-scope="scope">
                    <div class="info">
                        <div class="pic">
                            <img :src="scope.row.cover" alt="暂无封面" width="150px">
                        </div>
                        <div class="title">
                            <a href="">{{ scope.row.title }}</a>
                            <p>{{ scope.row.lessonNum }}课时</p>
                        </div>
                    </div>
                </template>
            </el-table-column>
            <el-table-column label="创建时间" align="center">
                <template slot-scope="scope">
                    {{ scope.row.gmtCreate.substr(0, 10) }}
                </template>
            </el-table-column>
            <el-table-column prop="status" label="课程状态" width="100" align="center">
                <template slot-scope="scope">
                    <el-tag :type="scope.row.status === 'Draft' ? 'primary' : 'success'">{{scope.row.status === 'Draft'
                        ? '未发布' : '已发布'}}</el-tag>
                </template>
            </el-table-column>
            <el-table-column label="发布时间" align="center">
                <template slot-scope="scope">
                    {{ scope.row.gmtModified.substr(0, 10) }}
                </template>
            </el-table-column>
            <el-table-column label="价格" width="100" align="center">
                <template slot-scope="scope">
                    {{ Number(scope.row.price) === 0 ? '免费' :
                    '¥' + scope.row.price.toFixed(2) }}
                </template>
            </el-table-column>
            <el-table-column prop="buyCount" label="付费学员" width="100" align="center">
                <template slot-scope="scope">
                    {{ scope.row.buyCount }}人
                </template>
            </el-table-column>
            <el-table-column label="操作" width="150" align="center">
                <template slot-scope="scope">
                    <router-link :to="'/edu/course/info/'+scope.row.id">
                        <el-button type="text" size="mini" icon="el-icon-edit">编辑课程信息</el-button>
                    </router-link>
                    <router-link :to="'/edu/course/chapter/'+scope.row.id">
                        <el-button type="text" size="mini" icon="el-icon-edit">编辑课程大纲</el-button>
                    </router-link>
                    <el-button type="text" size="mini" icon="el-icon-delete" @click='removeDataById(scope.row.id)'>删除
                    </el-button>
                </template>
            </el-table-column>
        </el-table>
        <!-- 分页 -->
        <el-pagination :current-page="page" :page-size="limit" :total="total"
            style="padding: 30px 0; text-align: center;" layout="total, prev, pager, next, jumper"
            @current-change="ChangeData" />
    </div>
</template>

<script>
    import { findAllCoursePage, searchObjAllCoursePage, removeCourseById } from '@/api/course';
    import { findAllTeacher } from '@/api/teacher';
    import { getNestedTreeList } from '@/api/subject';
    export default {
        data() {
            return {
                listLoading: true,
                list: null,
                total: 0,
                page: 1,
                limit: 10,
                searchObj: {},
                subSubjectList: [],
                teacherList: [],
                subjectNestedList: []
            }
        },
        created() {
            this.init()
        },
        methods: {
            init() {
                this.getAllCourse()
                this.getAllTeacher()
                this.getAllSubject()
            },
            //获取所有分类
            getAllSubject() {
                getNestedTreeList().then(res => {
                    this.subjectNestedList = res.data.items
                })
            },
            //获取所有讲师
            getAllTeacher() {
                findAllTeacher().then(res => {
                    this.teacherList = res.data.item
                })
            },
            //获取所有课程
            getAllCourse() {
                findAllCoursePage(this.page, this.limit).then(res => {
                    this.listLoading = false
                    this.list = res.data.items
                    this.total = res.data.total
                })
            },
            subjectLevelOneChanged(id) {
                for (let i = 0; i < this.subjectNestedList.length; i++) {
                    if (this.subjectNestedList[i].id === id) {
                        this.subSubjectList = this.subjectNestedList[i].children
                    }
                }
            },
            //带条件查询
            fetchData() {
                this.searchAllCoursePage()
            },
            //分页切换页面
            ChangeData(val) {
                this.page = val
                this.searchAllCoursePage()
            },
            resetData() {
                this.searchObj = {}
                this.getAllCourse()
            },
            //带条件查询分页查询
            searchAllCoursePage() {
                searchObjAllCoursePage(this.page, this.limit, this.searchObj).then(res => {
                    this.listLoading = false
                    this.list = res.data.items
                    this.total = res.data.total
                })
            },
            removeDataById(id) {
                this.$confirm("此操作将永久删除该文件, 是否继续?", "提示", {
                    confirmButtonText: "确定",
                    cancelButtonText: "取消",
                    type: "warning",
                })
                    .then(() => {
                        //调用方法进行删除
                        removeCourseById(id)
                            .then((res) => {
                                this.fetchData();
                                this.$message({
                                    type: "success",
                                    message: "删除成功",
                                });
                            })
                            .catch((err) => {
                                console.log(err)
                                this.$message({
                                    type: "error",
                                    message: "删除失败",
                                });
                            });
                    })
                    .catch(() => {
                        //判断点击取消
                        this.$message({
                            type: "info",
                            message: "已取消删除",
                        });
                    });
            }

        }
    }
</script>


<style scoped>
    .myClassList .info {
        width: 450px;
        overflow: hidden;
    }

    .myClassList .info .pic {
        width: 150px;
        height: 90px;
        overflow: hidden;
        float: left;
    }

    .myClassList .info .pic a {
        display: block;
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
    }

    .myClassList .info .pic img {
        display: block;
        width: 100%;
    }

    .myClassList td .info .title {
        width: 280px;
        float: right;
        height: 90px;
    }

    .myClassList td .info .title a {
        display: block;
        height: 48px;
        line-height: 24px;
        overflow: hidden;
        color: #00baf2;
        margin-bottom: 12px;
    }

    .myClassList td .info .title p {
        line-height: 20px;
        margin-top: 5px;
        color: #818181;
    }
</style>